Covariance analysis of ns motions in RNase A. In a, motional correlations are shown for WT, H48C-4MI, and H48C from a 20 ns MD simulation. Panels b–d show results for WT mapped onto a cartoon ribbon of RNase A. Positive correlations (b) between residues 1–22 and β1, β4, and β5 are shown. Panel c shows anticorrelations between residues 1–22 and β2, α3, and β5. Panel d shows positive correlations between H48 (stick rendering) and loop 1, β1, and β4.